Announcement

Collapse
No announcement yet.

GedMatch Website

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • GedMatch Website

    Hi guys can I get some advise?

    Got atosomal DNA results through and myOrigins basically tells me what I already knew, that I am 100% Jewish Diaspora and when I break it down it just says 100% Ashkenazi Diaspora.

    So I loaded my Raw data to GedMatch and have been playing with the Admixture tools, but I have no idea which one I am meant to use? there seems a lots of different options at every drop down selection!

    Can any one give any advice?

    Thanks, Seth

  • #2
    I did the Eurogenes Jtest model and got the following result

    Population
    SOUTH_BALTIC 3.87%
    EAST_EURO 0.48%
    NORTH-CENTRAL_EURO 6.51%
    ATLANTIC 8.09%
    WEST_MED 13.51%
    ASHKENAZI 27.91%
    EAST_MED 24.00%
    WEST_ASIAN 6.26%
    MIDDLE_EASTERN 6.56%
    SOUTH_ASIAN 0.21%
    EAST_AFRICAN 0.78%
    EAST_ASIAN 0.80%
    SIBERIAN 0.81%
    WEST_AFRICAN 0.20%

    Comment


    • #3
      Davidski, the genetic genealogy blogger who developed JTest, has publicly stated that only those given 25% or more Ashkenazi in JTest actually have significant Ashkenazi ancestry. Northern Europeans with no known Jewish ancestry usually are given a few percent Ashkenazi in JTest results and Sicilians/southern Italians with no known Jewish ancestry usually get 5-10% Ashkenazi. You can see that this test is more like a blunt instrument than a scalpel.

      Frankly, JTest is not a very good test for Ashkenazi ancestry. That's especially the case given that myOrigins gives you 100% Ashkenazi Diaspora! Is that accurate, considering your known ancestry?

      Given all this, I would disregard your JTest results, which hasn't given you any sort of real insight into your ancestry.

      Comment


      • #4
        Hi, thanks for the reply.

        It was no surprise getting the 100% Ashkenazi, I British with a complete paper trail of Jewish ancestors from Poland, Ukraine, Russia and Lithuania.

        I suppose I was just a little 'disappointed' that myOrigin could break it down any further. I mean I know I'm Jewish, I was just hoping it would list geographical areas? Or am I looking at this wrong?

        On the map on myOrigins, the highlighted area is centred on Poland, but stretches out to Ukraine/Russia etc again, I expected that.

        I'm still quite confused with all this!

        Thanks

        Comment


        • #5
          Originally posted by Seth_Rogoff View Post
          [----] I mean I know I'm Jewish, I was just hoping it would list geographical areas? [----]
          Someone would need to take a representative sample from cemeteries in every town Ashkenazim lived.

          Instead, they way I understand it, the samples were taken from emigrants living far away from original places, and the locations they had given as their ancestral locations were used.

          Comment


          • #6
            Thanks for the reply, so the admixtures tests on GedMatch are the accurate?

            Comment


            • #7
              Originally posted by Seth_Rogoff View Post
              Thanks for the reply, so the admixtures tests on GedMatch are the accurate?
              By their nature, they can only be approximations.

              If you happen to be from that part of population that is/was well sampled, the approximation could be a good one. If all of your grandparents came from towns with fairly isolated populations, then it could be very poor.

              Comment

              Working...
              X